This is related to cipher algorithm config occasionally failing during the handshake. As an immediate workaround I'd recommend trying to update to the latest JDBC driver which has a newer JRE which has some TLS cipher suite config updates which might mitigate the issue ( cf https://java.com/en/configure_crypto.html#TLSCipherSuiteOrder ) and also set the TLS version explicitly to 1.1 in the connection string.

Here is the latest version - https://github.com/microsoft/mssql-jdbc/releases/tag/v10.2.0